A hot tub pad is the smallest slab you will quote this month and the least forgiving one. The calculator above prices it by the square foot, with a broom finish at the example $9 rate, but on this job the footage is the least interesting part of the number.
Point loads change the spec
A patio holds furniture. A hot tub pad holds a filled tub plus occupants, and all of that weight lands on a small footprint. That is why these pads pour thicker than patio spec, typically 4 to 6 inches, with rebar or mesh in the slab. On a pad this size the upgrade is cheap insurance: the concrete difference between thin and thick is a fraction of a yard. Pour it stout, because a cracked pad under a placed, filled, plumbed tub is the worst repair access in residential concrete.
Level is the spec, not a nicety
Spa manufacturers want the shell fully supported and the pad level within a tight tolerance, and an out-of-level pad stresses the shell and voids goodwill fast. Screed it flat and check it before the truck leaves, and skip the drainage pitch you would put on a patio; the tub needs flat, and water management happens around the pad instead. This is one slab where the level in your truck matters more than the finish.
Conduit goes in before the mud
Most tubs need a dedicated electrical run, and the conduit stub-up has a specified location relative to the equipment bay. Coordinate with the electrician so the conduit is placed before the pour, per the spa’s spec sheet. The alternative is saw-cutting your own finished work.
Small pad, real minimum
Here is the honest math: an 8 by 8 pad is 64 square feet, and at the example $9 rate that is $576. The truck, the crew, and the mobilization cost the same as they do on a job ten times that size, so this is exactly where a minimum job charge earns its keep. What to charge per square foot for flatwork covers setting that minimum, and the concrete slab cost calculator handles the general-purpose version of this job.
The rates above are examples. PriceDesk runs this calculator with your rates and your minimum built in, on your phone, free for 14 days.